The lovely aroma of water mint is given off when the leaves are brushed. This is a British native pond plant, a great plant for any pond. Pretty flowers are a delicate mauve, appearing in summer. Water mint is a rafting plant, spreading out from the pond margins to form a floating mat that gives cover to fish and habitat for pond ceatures. The fibrous roots dangle into the water where they absorb toxins and pond waste, making mint a good water filtration plant. Easily controlled by cutting back when required.